CN110987442B - Calibration method for performance of engine pedestal of extended range electric automobile - Google Patents
Calibration method for performance of engine pedestal of extended range electric automobile Download PDFInfo
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- CN110987442B CN110987442B CN201911396083.XA CN201911396083A CN110987442B CN 110987442 B CN110987442 B CN 110987442B CN 201911396083 A CN201911396083 A CN 201911396083A CN 110987442 B CN110987442 B CN 110987442B
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- G—PHYSICS
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- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M15/00—Testing of engines
Abstract
The invention discloses a method for calibrating the performance of an engine pedestal for an extended range electric automobile, which adopts the technical scheme that the method comprises the following steps: step 1, driving a generator in a range extender assembly to operate in a constant rotating speed mode; step 2, calibrating an air inlet model, oil injection and an ignition angle of the engine; step 3, collecting and storing data information of the engine speed, the throttle opening, the load, the ignition angle, the torque, the power, the oil consumption, the emission and the like under each calibration working condition; step 4, analyzing the data information, making curves of maximum torque, maximum power and minimum specific fuel consumption values, and calibrating an engine torque model based on torque feedback of a generator; and 5, coupling and calibrating the engine power parameter, namely the output torque of the engine, and the power generation power of the generator. The invention has the effects of realizing quick and accurate torque output response of the engine, stabilizing the power output of the range extender and shortening the steady-state time when each power point is switched.
Description
Technical Field
The invention relates to the technical field of performance calibration of an engine pedestal for an electric automobile, in particular to a method for calibrating the performance of the engine pedestal for an extended-range electric automobile.
Background
In the earlier stage of using the engine for a real vehicle, various performance indexes of the engine need to be developed to meet the development requirements of the whole vehicle, so that the engine pedestal calibration needs to be carried out on a special pedestal of a range extender, and the performance of the engine is calibrated according to various use working conditions of different rotating speeds and different loads to ensure that the dynamic property, the fuel economy and the emission performance of the engine under various working conditions are optimal.
The chinese patent with publication number CN107831016A discloses a double-cylinder engine bench calibration system, an ac electric dynamometer of which is fixed on a cross-shaped groove type damping base of a laboratory through a steel structure fixing bracket; the torque meter is arranged on an output transmission shaft of the alternating current power dynamometer; the elastic coupling is connected with a flywheel disc of the double-cylinder engine assembly and the alternating current power dynamometer; the cylindrical steel bracket is used for fixing the double-sided steel plate fixing bracket of the double-cylinder engine; the double-sided steel plate fixing support of the double-cylinder engine is used for fixing the double-cylinder engine assembly.
However, the engine parameter calibration of the double-cylinder engine pedestal calibration system is measured by professional test equipment, namely a dynamometer, and the requirements on test environment and equipment acquisition cost are high; when the engine parameters calibrated by the dynamometer are directly applied to the range extender for use, the torque output value fed back by the engine and the torque value of the input shaft fed back by the motor have certain difference under the condition that the engine and the motor are in rigid connection, the requirements of torque closed-loop control under a steady-state power generation working condition and torque quick response during power switching are not facilitated, the service life of the engine is influenced, and improvement is needed.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide the method for calibrating the performance of the engine pedestal for the range-extended electric automobile, which has the effect of realizing the quick and accurate response of the torque output of the engine under the constant-power generation working condition of the range extender and when each power point is switched.
In order to achieve the purpose, the invention provides the following technical scheme:
a calibration method for performance of an engine pedestal for an extended range electric automobile comprises the following steps:
step 1, driving a generator in a range extender assembly to operate in a constant rotating speed mode;
step 2, calibrating an air inlet model, oil injection and an ignition angle of the engine;
step 3, collecting and storing data information of the engine speed, the throttle opening, the load, the ignition angle, the torque, the power, the oil consumption, the emission and the like under each calibration working condition;
step 4, analyzing the data information, making curves of maximum torque, maximum power and minimum specific fuel consumption values, and calibrating an engine torque model based on torque feedback of a generator;
and 5, coupling and calibrating the engine power parameter, namely the output torque of the engine, and the power generation power of the generator.
By adopting the technical scheme, in the application environment of the range extender, the generator is used for replacing the function of the traditional dynamometer, and the calibration process of an air inlet model, oil injection, ignition and torque model of the engine is realized, so that the torque output response of the engine is quick and accurate when the constant-power generation working condition of the range extender and each power point are switched; meanwhile, the torque value is fed back by the dynamometer simulated by the motor for the range extender, so that the parameter calibration process of the engine is realized, and the aim of effectively reducing the cost is fulfilled.
The invention is further configured to: the calibration of the air inlet model in the step 2 comprises the following steps:
step 1, setting a minimum rotation speed of n r/min, and keeping the minimum rotation speed of n r/min;
step 2, increasing the throttle opening of 10% to the throttle opening of 100% from 1O% (including 10%) in sequence, and calibrating an air inlet model calculated based on air inlet pressure and temperature at each throttle opening;
step 3, increasing the rotating speed m r/min, and repeating the step 2 until the rotating speed reaches the set highest rotating speed l r/min;
and 4, calculating the slope and intercept of the rotating speed and recording a calibration table.
By adopting the technical scheme, the air inlet model is effectively calibrated.
The invention is further configured to: the calibration of the oil injection in step 2 comprises the following steps:
step 1, setting a minimum rotation speed of n r/min, and keeping the minimum rotation speed of n r/min;
step 2, sequentially increasing 10% of throttle opening from 1O% (including 10%) to 100% of throttle opening, adjusting oil injection pulse width (oil injection time) at each throttle opening, and determining oil injection calibration under the working condition when the concentration of combustible gas mixture is 1;
and 3, increasing the rotating speed m r/min, and repeating the step 2 until the rotating speed reaches the set maximum rotating speed l r/min.
By adopting the technical scheme, the oil injection is effectively calibrated.
The invention is further configured to: the calibration of the ignition angle in step 2 comprises the following steps:
step 1, setting a minimum rotation speed of n r/min, and keeping the minimum rotation speed of n r/min;
step 2, sequentially increasing 10% of throttle opening from 1O% (including 10%) to 100% of throttle opening, adjusting the angle of the ignition advance angle at each throttle opening, and determining the ignition angle calibration under the working condition when the torque output of the engine is maximum;
and 3, increasing the rotating speed m r/min, and repeating the step 2 until the rotating speed reaches the set maximum rotating speed l r/min.
By adopting the technical scheme, the ignition angle is effectively calibrated.
The invention is further configured to: and 4, calibrating the torque model in the step 4, namely obtaining the relation between the air inlet load and the thermal efficiency (the specific oil consumption is lowest) at each rotating speed based on the optimal ignition angle calibration data, and fitting to obtain a corresponding thermal efficiency curve.
By adopting the technical scheme, the torque model is effectively calibrated.
In conclusion, the invention has the following beneficial effects:
1. the torque value fed back by the dynamometer is simulated by the motor for the range extender, so that the parameter calibration process of the engine is realized, and the cost is reduced;
2. the torque output of the engine for the range extender is more accurate and faster, the coupling calibration of the power parameters of the engine and the power generation power of the generator is realized, the power output of the range extender is stable, and the effect of shortening the steady-state time is achieved when each power point is switched.
Detailed Description
A calibration method for performance of an engine pedestal for an extended range electric automobile comprises the following steps:
step 1, driving a generator in a range extender assembly to operate in a constant rotating speed mode;
step 2, calibrating an air inlet model, oil injection and ignition angle of the engine by using a rotating speed-load- (calibration unit) meter of the meter 1;
step 3, collecting and storing data information of the engine speed, the throttle opening, the load, the ignition angle, the torque, the power, the oil consumption, the emission and the like under each calibration working condition;
step 4, analyzing the data information, making curves of maximum torque, maximum power and minimum specific fuel consumption values, and calibrating an engine torque model based on torque feedback of a generator;
and 5, coupling and calibrating the engine power parameter, namely the output torque of the engine, and the power generation power of the generator.
It should be noted that the calibration of the intake model in step 2 includes the following steps:
step 1, setting a minimum rotation speed of n r/min, and keeping the minimum rotation speed of n r/min;
step 2, increasing the throttle opening of 10% to the throttle opening of 100% from 1O% (including 10%) in sequence, and calibrating an air inlet model calculated based on air inlet pressure and temperature at each throttle opening;
step 3, increasing the rotating speed m r/min, and repeating the step 2 until the rotating speed reaches the set highest rotating speed l r/min;
and 4, calculating the slope and intercept of the rotating speed and recording a calibration table.
The air inflow is calculated by the air inflow pressure and the air inflow temperature through a formula, and the calibration of the air inflow model is used as a mode for correcting the calculated value, so that the difference between the actual air inflow (the actual air inflow under each working condition can be measured by an instrument) and the calculated air inflow is reduced.
The calibration of the oil injection in step 2 comprises the following steps:
step 1, setting a minimum rotation speed of n r/min, and keeping the minimum rotation speed of n r/min;
step 2, sequentially increasing 10% of throttle opening from 1O% (including 10%) to 100% of throttle opening, adjusting oil injection pulse width (oil injection time) at each throttle opening, and determining oil injection calibration under the working condition when the concentration of combustible gas mixture is 1;
and 3, increasing the rotating speed m r/min, and repeating the step 2 until the rotating speed reaches the set maximum rotating speed l r/min.
The calibration of the ignition angle in step 2 comprises the following steps:
step 1, setting a minimum rotation speed of n r/min, and keeping the minimum rotation speed of n r/min;
step 2, sequentially increasing 10% of throttle opening from 1O% (including 10%) to 100% of throttle opening, adjusting the angle of the ignition advance angle at each throttle opening, and determining the ignition angle calibration under the working condition when the torque output of the engine is maximum;
and 3, increasing the rotating speed m r/min, and repeating the step 2 until the rotating speed reaches the set maximum rotating speed l r/min.
And the torque model in the step 4 is calibrated based on the optimal ignition angle calibration data, the relationship between the air intake load and the thermal efficiency (the specific oil consumption is lowest) at each rotating speed is obtained, and a corresponding thermal efficiency curve is obtained through fitting. It should be noted that the calibration of the engine torque model is the actual engine torque output value (which uses the generator torque feedback value) at different rotation speeds, loads and ignition angles, and the calibration of the engine torque model is a three-dimensional MAP.
In conclusion, in the application environment of the range extender, the generator is used for replacing the traditional dynamometer function, and the calibration process of an air inlet model, oil injection, ignition and torque model of the engine is realized, so that the torque output response of the engine is quick and accurate when the constant-power generation working condition of the range extender and each power point are switched; meanwhile, the torque value is fed back by the dynamometer simulated by the motor for the range extender, so that the parameter calibration process of the engine is realized, and the aim of effectively reducing the cost is fulfilled.
Table 1: tachometer for measuring speed and load (calibrated unit)
The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiment, but all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the present invention may occur to those skilled in the art without departing from the principle of the present invention, and such modifications and embellishments should also be considered as within the scope of the present invention.
Claims (4)
1. The method for calibrating the performance of the engine pedestal for the extended range electric automobile is characterized by comprising the following steps of:
step 1, driving a generator in a range extender assembly to operate in a constant rotating speed mode;
step 2, calibrating an air inlet model, oil injection and an ignition angle of the engine;
step 3, collecting and storing data information of the engine speed, the throttle opening, the load, the ignition angle, the torque, the power, the oil consumption, the emission and the like under each calibration working condition;
step 4, analyzing the data information, making curves of maximum torque, maximum power and minimum specific fuel consumption values, and calibrating an engine torque model based on torque feedback of a generator;
step 5, coupling and calibrating the engine power parameter, namely the engine output torque, and the generator power generation power;
wherein:
in step 4, the torque model is calibrated based on the optimal ignition angle calibration data to obtain the relationship between the air intake load and the thermal efficiency at each rotating speed, and a corresponding thermal efficiency curve is obtained by fitting; and the calibration of the torque model is the actual engine torque output value under different rotating speeds, loads and ignition angles, and the calibration of the engine torque model is a three-dimensional MAP.
2. The method for calibrating the performance of the engine mount for the extended range electric vehicle as claimed in claim 1, wherein the calibration of the intake air model in step 2 comprises the steps of:
step 1, setting a minimum rotation speed of n r/min, and keeping the minimum rotation speed of n r/min;
step 2, sequentially increasing the throttle opening of 10% to the throttle opening of 100% from 1O%, and calibrating an air inlet model calculated based on air inlet pressure and temperature at each throttle opening;
step 3, increasing the rotating speed m r/min, and repeating the step 2 until the rotating speed reaches the set highest rotating speed l r/min;
and 4, calculating the slope and intercept of the rotating speed and recording a calibration table.
3. The method for calibrating the performance of the engine mount for the extended range electric vehicle as claimed in claim 1, wherein the calibration of the fuel injection in step 2 comprises the steps of:
step 1, setting a minimum rotation speed of n r/min, and keeping the minimum rotation speed of n r/min;
step 2, sequentially increasing 10% of throttle opening from 1O% to 100% of throttle opening, adjusting oil injection pulse width at each throttle opening, and determining oil injection calibration under the working condition when the concentration of combustible gas mixture is 1;
and 3, increasing the rotating speed m r/min, and repeating the step 2 until the rotating speed reaches the set maximum rotating speed l r/min.
4. The method for calibrating the performance of the engine mount for the extended range electric vehicle as claimed in claim 1, wherein the calibration of the ignition angle in step 2 comprises the steps of:
step 1, setting a minimum rotation speed of n r/min, and keeping the minimum rotation speed of n r/min;
step 2, sequentially increasing 10% of throttle opening from 1O% to 100% of throttle opening, adjusting the angle of an ignition advance angle at each throttle opening, and determining the ignition angle calibration under the working condition when the torque output of the engine is maximum;
and 3, increasing the rotating speed m r/min, and repeating the step 2 until the rotating speed reaches the set maximum rotating speed l r/min.
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| CN111976711A (en) * | 2020-09-01 | 2020-11-24 | 宁波洁程汽车科技有限公司 | Matching method for range extender efficient area |
| CN112213107A (en) * | 2020-09-04 | 2021-01-12 | 哈尔滨东安汽车发动机制造有限公司 | Method for testing engine oil consumption rate on extended range electric automobile |
| CN113153543B (en) * | 2021-03-18 | 2023-01-03 | 联合汽车电子有限公司 | Air intake load model correction method and vehicle |
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Effective date of registration: 20230927 Address after: 315100 East 1st Road, Science Park, Jiangshan Town, Yinzhou District, Ningbo City, Zhejiang Province Patentee after: Ningbo Shenglong New Energy Vehicle Power Co.,Ltd. Address before: 315000 zone 4, 1st floor, building 2, building 005, 1177 Lingyun Road, high tech Zone, Ningbo City, Zhejiang Province Patentee before: NINGBO JIECHENG AUTOMOTIVE TECHNOLOGY CO.,LTD. |